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Q.

The amount of urea to be dissolved in 500 ml of water (K = 18.6 K mole-1 in 100 g solvent) to produce a depression of 0.186oC in freezing point is:

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a

6g

b

3g

c

9g

d

0.3g

answer is C.

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Detailed Solution

ΔTf=100×K×Wm×W  0.186=100×18.6×w60×500;  w=3 g

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